HD Bagger for a 2011 152?

How many bagger options does Gravely offer for the 152? It looks like from their mower brochure they have a 2 or 3 HD bag bagger for this line, but they have others that I am assuming are just for their smaller ZT line.

I just want to make sure I get the biggest two bag setup that has the biggest fan on it.

Thanks for the reply. I just got the three bag today on my 152, but have not used it yet. Do they offer any longer bags? Also, is there a reason the 100 and 200 series have the fan mounted on its side instead of vertically like the one you pictured that fits the ZT series only?